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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fe1334458856b801604598143fc345f18c0e5b50f6745b0c5000b6ef761886f' 
  AND token = 'J/z7kGwNettf9IZoXXCoCOjfn0V6/lf2Piwk3PEYZzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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