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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '637bc87bd5c11a07f1cd3dd9cafbf1b301ec403067c544c6cb8f384cc403ed29' 
  AND token = 'hrFi8KH8mOpZIN8Dcg639P4/GVZ0YI9pMvKNKFYNh7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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