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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6a25ac4d1c8b1ffb4564c0e88213413c6798c30dba28e9af28266c5c2ccc130' 
  AND token = 'J7JD5Yfmc5dZALIXTfZXgaiCnboj511gI873kvvEG9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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