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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c48cd5919f6e930863868d227541bb17d1bd6da499cfa277fd049c457773629' 
  AND token = 'WDVM4bk7X0mVn5cfoKoPQ2NmgyrUNxU6b7T93WN4s7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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