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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '237cd0aae29be3e9b447e1bf0cce493edc4e8909a0ce87aee311e87e0fd56d36' 
  AND token = 'h5lXb7nR97vEPplTO3FgDkXz/9k9eJW/IOAe0gez564=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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