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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15b9f1ba4cd9fe0341461e7e39b1198f06dbf5b8bf15940c35aec2092e7ea7ac' 
  AND token = 'nbJbMeM12axUfka+/L6Cn/K6iKGjO0BaRMbMYsS6iWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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