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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ada1592f227cc48282e67a1981bab998146c3be48257bd7fa9a58ed0b0da072d' 
  AND token = 'JbOnkNi2eWk+LAI9AKxSYNYpj1nujL2aLLjoNzCURes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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