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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '809d61ec1e06633afd978b2d9edd5ccccd99d96f8ecd92139b8550a27244b4f1' 
  AND token = 'cGm8LcRXw6bw69XpCbb6tkMc8hsWGpNb2QxgCNmnXZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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