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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30579b6823256104d7eea612d02bf2c01fc2408a20922a26b5fef5f9a3e6caa9' 
  AND token = 'Sw8327L/fAgqJ8DUbe45JleynmGf5P4xp9FQTP1k0iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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