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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f99eaacc77ef9802cd771801c26f10abaf02bfa3f3d0a0a8253624e1e2142aa' 
  AND token = 'edtbi4tfevJg9Yy3A02fDlnBrv5B2tYS6XIKYDhheKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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