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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd88912f30277fb3b5b20fd31d644e880fc6ae1cf8877ce0ebee9132b7eae9e1' 
  AND token = 'WiJhrcJ3SWN2NGvbgVPoSTRT946S2lErxQYmY3mxIgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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