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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32f777dee2d56473a56c2c3a0911ec0e1380d0dc867af7feb4a80203a3ac9f8d' 
  AND token = 'otnr/leWfUET/0siXiYW11R+EirJckPdx2ywpCE+0nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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