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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4de00b6b225d0c38383d8ba2cfc62ec25fc62d2dbdfb772b03c32851a3ebda75' 
  AND token = 'Ozqcdp4rS3rGFWAD2rAp/ZL6aPaYlHM1LFno9ydGy1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}