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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '358796db8a78cf6436ccda3c2f07e989bf24bc84ccf8a91fe2b32686c472c3d0' 
  AND token = 'ndNo+gLUhCOBHbI7rcJ93tIxG2kRUwiobuA8VdWwFm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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