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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88dcb7269085875d556680d0db13e9e82f5d6e8f39f75aca055a38bc0f513cc4' 
  AND token = 'KKYt4kDXR8T9Zt8lhToguc1s/12jgGyi7OHCXz1F8lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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