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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c91aafe942afd1429115129e34787524fe7968365064739ff5359c9753bd000' 
  AND token = 'sC8jFnOjley4VgHQ3Lxh1V8EsnvOg3DXxb1CRCDXotc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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