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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e5c9515962b2c33a6bd168953a1a231e277e26c7ea9233a598ee10f064def7d' 
  AND token = 'KXSHk517N/QYgOd5wQOezgbMs4mbM70FgVV7ZJ7beko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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