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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f6bdf45cf9043ea8e540d08a36651f95d76912d995c690eeef04d4475b7842b' 
  AND token = 'J0GtD2kZVx6CiB8tnys2VVMk2o2qkJxaNGtNd0ucrNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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