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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c65834ef7219f7a3cbe1d5f3fff408344f347ff0bbb223cf842cfb85774318b8' 
  AND token = '7R+fVc7bJGjrMCx0YP3+bkJ4SnBj9dcmS3lJb2PVEp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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