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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd9aa074b897f0619cce670cd3b1a2564c0db31ecea41225e0b2c8762cf9c075' 
  AND token = '8YmSO00c36TiCUhj8ySR+8gIsrtrIWPOEIhfeeErq6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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