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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73099c26541bf32071253060d920cd9a70f79b384ef145fe605079a66c369d7a' 
  AND token = 'XTCWG0KjC6QNR4rUELWf4FFL8GVQeLMqILbGqt+OF1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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