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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ef27e78b2f04b59e8bd56dd1dbaa7d8ca5a81a6d4ffffe9e44d49dd4fe07e47' 
  AND token = 'LEj7jA2UH9LP/E9gn6XzrO6Trd9GyjPQulgXYVyZQuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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