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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d924d62e8bb316115bdd21b612a9291bbd88f1dfc805e2defff9c21f7443cb1' 
  AND token = 'VndaWqbet0+YQg4bQc6lE1Eb9+gvdxHX2RHgs2Lx4yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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