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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '984a6bfbced3bbb4378233cf93f04a7b074880d6645e0544172a3243b60a70d0' 
  AND token = 'xz6qZ9FZXL+ni4GAyiDRWSwgliNs4PQuYV9Z+W7e37E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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