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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79d7f3d9e666bb284e9e6d980e9d9335d46e38a09f9fd21745731c48cd091909' 
  AND token = 'x68qU365mQq1O11r504KrL2S8M81RR6SeBxKlashXII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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