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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02cb6cc85edb2889c2f041a2c2fa6999f89c0c2ce3b7f74477393630019c37df' 
  AND token = 'Wk3/J0nuzL7CnyM07kfJrhfOUHNQNUdo5x+cCen9d2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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