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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6944742fac70d411b9af3300ae7e8aa4d01a100296ddafa6e9bdcf878b6086a1' 
  AND token = 'falirTx1ze0Sp8L2+sT4PfTPOGyVjlaFd6aUgV6f5Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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