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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd63c5bc7019051c67e811a9d5b466698c1c377bc2a2d6310c7330fd0e9a63b8e' 
  AND token = 'cwrRfr/GFM5l3WIDQvaTe4fYe8hteTYoznUnUSQ6yNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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