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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5902111ae61b1bd7a20240af31508ec20ebf8d6f7660fb32eb3b9237a0808450' 
  AND token = 'feVxkUvU1Lsx7kaIc6ztLfBQBr90Y4oDlKRr6/LC5Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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