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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e37292f99f9e416d0a15b7698caad4f175ef1ccd5456f993892e937f7506f19' 
  AND token = 'C8nn5kUd8RErMQt5c/+4gFp7QfrPLa9vFZNsyZwXpXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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