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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd32bf7f252583eb6b1c979b89ae81ef99b28b811ce63ec1e5338fff8a2ed0784' 
  AND token = 'lBbaO5QQGTSxlwTMMKxBsN+a6fT99y0s6cmJzf6xHzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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