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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee96bf04eb18352fb3d7d68b4adac6dadb4a03650ca0e550d753186dd8542449' 
  AND token = 'GyfizSKjxsntUuQeuojbykQAuoyV89OgbERDIYAZ1UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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