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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d6cb751c68861d67cb672363d2edf777add1c6f4da93f201cc5c36f123e767c' 
  AND token = 'RUeQf254TXjQq15Un5h+CUVfSFajabUTky6L2GX9dyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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