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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1698fc1cf0b7aef89315d438bb95354c5e3b8b6cac32de2f20f0017ff9e7a2e5' 
  AND token = 'NUKKxjrTWkp4boYv42CDDWs/L7NK/W96vXqyyGAA0YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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