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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34642c04ab9ca99bece35bd9a1b41d61135ebcb7b9776c6bc609c17d0b453fce' 
  AND token = 'wNg+ct5pdLChLijHPgQOmx1njGHr2Xubj99JEwgcJyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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