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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a7078aee6ebc8e66c1ab88efccaa24a6a82d8dc03f71a7b94ad0ae49ac35c9c' 
  AND token = 'OkJgnwWQenBhGsvJ4xnFkaUyBaFcjrfHEtu1hE3U/Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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