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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdb797caf20a939db4e3d8e24aa2c372fd2450ba8ba649da273117a2e0b2dffe' 
  AND token = 'nBdsvnxMoc3ca6yTz3lNUjDT75tvzQGDfQFxn7xkMsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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