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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef1746f8c097ebd8127ea76347b36c1970f058f1f0366c56d767b30142c7bcc4' 
  AND token = '6AehmpW3+iwGE2MMOI1moY0U3AteYEcThHr5euQYAPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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