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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f09e2f69a3120a5b353189aaefaeee3cfd14404db6ee9cf637acac73fbe904cc' 
  AND token = 'K7iRk6YODnIODvj/QrJ/TX4vEWCezu49sqlOu7pO4T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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