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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '556c07ba3de396ef7b14a84ec5f90fefce66062a47bb29980a8ea511af3e5212' 
  AND token = '/48O7zo1/FcRuGY4q1/X/rpSLgi67bIZutIRA0iYFwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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