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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f0163f56334d387a52d36e770576b8e48c95bfbbdd22b93f423e21f8bd7cd88' 
  AND token = 'HYjNdRHgTZ43b1hTis6HmhnSywW8vBTomcdsptgQ2p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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