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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '346c6f3507a52ecf3c77eaad9b8fc595ae918b192f6eb77e6d5aa81fdeebbba8' 
  AND token = 'LFtazL+xdLSgPc/1sx1y8cB8iIfNA7KOCZGzAsccc7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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