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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abad0eb954801a15e1077885734d72379cca4327f133fa9227d63062e23831cc' 
  AND token = 'Ik2bES1tFs0EjWRXEd9iawCNH6UD/SaUgZWH9tJLj/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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