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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f2eed370fd30761bbac7a1ee81f12b77c02fd5acbb4a26fa603a5a81eed4f16' 
  AND token = '+T9S6ujurVqqOXQmXf9J6xnCT/rbkYrlJau6Gf5MA1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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