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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15ec02e5b07e9e95abe195cb106582e17b8948fd3beb38251d00a29869e126a2' 
  AND token = 'Nfaz4Z6QMDF6eEv807gKrTCJdh1gG9xGtfEjUyI84Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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