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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35b4583988bfe5831d4f5a72a737c2651b9623862cdc61080aa1278e5976e210' 
  AND token = '/3C7mUJvWFatGfWcQlasBKTSO2CO5V4w82dkngQ3/i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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