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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3aa06c093c50c28d94c4ae0e72756b9bf26c3a99f0ced1371f28b686c2ed247a' 
  AND token = 'KjnMWNI3jSQGjqT+U025iZOc+EOijIZeD3QR7wl5wSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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