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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fd4857b76bd1ba756dcd1097054c5cba21e6280d07e2220473e652f21c0d67e' 
  AND token = 'U2njs23Y7GFpka50AjEdLsd7st/mUvb3Ou1hqstaALA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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