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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '718b5ef9d52bd4fb07d5e9d985cbdc1ab73e0a83afbb5815bf45a3c807d13f7c' 
  AND token = 'as5jep3CKmQIofWJnabJvvL03eGrMTFc4xLlndi4B/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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