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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a639b842e026eabdd89518ea19efa81ffa67fbb1be6db94398f02a366cfb5f60' 
  AND token = 'R5mOo4kafXLHk6+nG3nVnTFZzs7YxmSISrat0HAR0Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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