SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc88a78f37f9f96cf3df11b7176368f6b11f10d8d069a9b5c408f59198e4edf1' 
  AND token = '5XcfRQY7IvU4/MlQmwwvVHQOTpM6P1ZfhCsXzXAoVhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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