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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ae096cadabdc86815fac41a785c70607742da5be3fcc3629d1d39e6310410f8' 
  AND token = 'qyBW/GQ4ijNZiC7bMPAUIxHlS/33I5qFZ9U/WQrSgE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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