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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38f663b1cbf6bedb377b7f433a655e8112d661aa05979f254fb88f85ba2e30e3' 
  AND token = 'Xc9K6aUWcHQ8Rn/Uu8m2qWSucnG3O8e/GL6LbvkA2Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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