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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5a66a5e7483708ae86e94edcc433ed257a976865b4f8fa77fdc764cfc10e425' 
  AND token = 'Nn6aUSOht+yxNQqtKUsGtjoltVgPVSFDIwK/lfu583E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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