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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88e854dfbfd854e003cc1fca1aa173779bf4450997d98ac215978e785844b2cc' 
  AND token = 'pEEDRSijMWWTYNWrzTuoRVQ0rmET8jNDbn5RyMms50c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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