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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b5e15e2aeb98b2ac8b8ddac11947570e90af13c230353aaedf44b8680447056' 
  AND token = '3SNZEpXxrD01s41y9VzIe8FXOG4cUAdlNJUG7JdOzSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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