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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c72f0383fea4d4339ffa6a94a0cf4b1885c9f8132ea8325cc900f7ab59a89a4' 
  AND token = '5OcCdoXG2mb/Sa4fWpZMZ07aq1WlsWVdU0D+27j6Hkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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