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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6a23726175b1b175c8f7b596a48fde924ff16cf4e138287fdcc855824163a93' 
  AND token = 'QsfvLtHcMFEbXR3xK2BmNe7horFEXH8NpMCfwbnrayM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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