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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1003ec663329fc067195e755381bda8a236a4390c86e30e79fc34f456858069b' 
  AND token = 'vg5SwIh/QKmsWUDHLETnS7Sr622S9NtuU9AArcvSe2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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